{"id":"7cbc9731-8edf-4f97-ab8b-1e3334329ecc","shortId":"TqQD3K","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/184` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts exact-scheme payments on Base, with a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 (USDC uses 6 decimals). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nHowever, the exact functionality behind this particular endpoint path (`/payments/184`) is unclear. The platform's landing page lists many specific API endpoints (analytics, AI, finance, utilities), but `/api/v1/payments/184` is not among them. It may be a generic or dynamically generated payment resource. No OpenAPI schema, detailed documentation, or example request/response bodies were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["x402 api","pay per call api","usdc api access","base network api","micropayment api","lowpaymentfee","premium api"],"warnings":["The exact functionality of /api/v1/payments/184 is not documented — it does not appear in the platform's listed API catalog.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.","The purpose of this specific endpoint versus the platform's other listed endpoints is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/184","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/184","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/payments/184 is not described anywhere in the crawled material. The docs pages are empty beyond a wallet-connect 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'/payments/184':170 '/request':13,28 '0.02':12,27,81,137 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':134 '20':128 '300':150 '6':140 'accept':117,155 'access':7,22,38,108 'address':146 'ai':65,184 'among':191 'analyt':64,183 'api':6,21,37,60,93,107,181,219 'application/json':160 'base':9,24,89,123,130 'base network api' 'behind':165 'bodi':211 'call':4,19 'categori':61 'challeng':112,114 'commit':98 'confirm':115 'connect':228 'content':234 'crawl':216 'data':63 'decim':141 'detail':206 'doc':218 'document':207 'dynam':199 'endpoint':32,49,74,102,154,168,182 'equal':136 'exact':119,163 'exact-schem':118 'exampl':209 'financ':68,185 'found':213 'function':164 'generat':200 'generic':197 'host':56 'howev':161 'includ':62 'infrastructur':71 'json-response' 'key':94 'label':105 'land':176 'learn':67 'limit':96 'list':178 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':66 'made':144 'mani':48,179 'maxamountrequir':126 'may':194 'micropayment api' 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':204 'page':177,223 'particular':167 'path':169 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':84 'payment':42,121,142,201 'per':3,18,82 'platform':54,77,174 'post':156 'post-method' 'premium':5,20,36,106 'premium api' 'price':79,220 'prompt':230 'protocol':43 'provid':35 'rate':95 'readm':222 'request':83,157 'request/response':210 'requir':99 'resourc':202 'return':159,225 'schema':205 'scheme':120 'second':151 'specif':101,180 'substant':233 'timeout':152 'unclear':172 'unit':131 'usdc':15,30,86,133,138 'usdc api access' 'usdc-base' 'use':139 'util':72,186 'varieti':58 'via':10,25,39 'wallet':229 'web3':69 'x402':11,26,41,111 'x402 api' 'x402-payment'","prices":[{"id":"6518b6e9-1fed-471e-9d66-4980a36aad49","listingId":"7cbc9731-8edf-4f97-ab8b-1e3334329ecc","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/184","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:37.167Z"}],"sources":[{"listingId":"7cbc9731-8edf-4f97-ab8b-1e3334329ecc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/184","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:37.167Z","lastSeenAt":"2026-04-22T09:01:15.967Z"}],"details":{"listingId":"7cbc9731-8edf-4f97-ab8b-1e3334329ecc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/184 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms maxAmountRequired of 20000 base units of USDC on Base with 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/payments/184"}],"useCases":["Accessing paid API endpoints without API key registration","Making micropayment-gated API calls using USDC on Base","Agent-driven programmatic access to premium data or services"],"bestFor":["Developers wanting zero-signup API access with crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-per-use over subscription models"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","Use cases requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.338Z"},"updatedAt":"2026-04-22T09:01:15.967Z"}}